Toll switching system



March 10, 1953 J. E. OSTLINE 2,631,195

' TOLL SWITCHING SYSTEM Filed Jan. 29, 1949 14 SIieets-She'et 3 I -Rep'r. Cir.

Tone Unit I 302 ll60\ Re 1 Cir K13 Nuflonul Toll C": I T u s l 303 Inc Off. Sel. 7 o

332 5 2 Tone Unlf 30 I Reg. TransL |l50 1 V I 1 Rept Cir. Inc. Toll Sel. Inc. Toll Sel. Inc. Toll Sel. 306

32! 323 326 I 5 f 1' Tone Unit 3o? L J L H I Access 36L 33] e AMBER TOWN IO ll l2 l3 l4 l5 INVENTOR.

John E. Osfline BY Affys.

March 10, 1953 J. E. OSTLINE 2,631,195

TOLL SWITCHING SYSTEM Filed Jan. 29, 1949 14 Sheets-Sheet= 4 I03 Rept. Gir. Rept. Cir. lei

Tone Tone 05 I Unit, Unit Z 4|\ 4|? Repeater Oi: Inc To I 7 Set. 42 Tone Unit Inc. Toll fi roz Sei. e03 O6 5 Rept. Cir. 1 ReptCir. T I 404 45 Inc. Toll I Sel. 4l8

Tone Unit Tone Unit 6 lnc. Toll Inc. Toll 'i Sel. 4l5

MAROON LEA ORANGE BAY INVENTOR.

John E. Osthne BY Attys.

March 10, 1953 J. E. OSTLINE 2,631,195

TOLL SWITCHING SYSTEM Filed 1949 14 sheetses'heet 5 T LRept. Cir. H f Rept. Cir.

52 54 F T Inc. Toll Tone L lsnii Sel. 52 5 Tone Unit 22 7 529 542 s h s3o 7 J95 Rep'r. Cir. I Reg Trans I To Inc. Toll lnc. Toll Sel. 543 Sel. 548 Tone Unit Q 7 7 e s Y P lnc. Office 528 To" Sel Rept. on. 4 549 546 Inc. Special 8 9 Serv. Sel. 1 o 2 Tone Umt I547 2-L (sou) mu. Trunk an. r

- Trunk 0h: GREEN FIELD F 5'0 I F I Toll Conn. Z SeI. l Sel.

- 5l8 5w 516 5l5 5'.- D'm.

503 f 1 Line 0n. Finder Local Sel. 502 504 505 50 T w AL INVENTOR. John E. Osfline BY March 10, 1953 J. E osf N 2,631,195

TOLL SWITCHING SYSTEM Filed Jan. 29, 1949 I4 'Sfi'ets-Shet 6 IOBK l08\ lny fl 'k- -Ans.Sw. Coll Sw. Delayed 6 Clr. 64l 632\ 633 634 .C0ll 8w. 9

r 8 Finder Local l C.L.R.Trk. 7 4

604 Sal. 605 642 Llnk Dist Srort Cir. 44 643 I 0 RPOS Sender ca 63!] 1 Confr. 636

638 F Sender637H 21 DIAL TOLL BOARD 630 Bow Toll Conn. 2114: Sel. l Eiel. Access Set.

w. Desk 607 GOLD HILL INVENTOR.

John E. OsHine BY M, 051w. M

March 10, 1953 J ,os1' 2,631,195

TOLL swi'rcnmc SYSTEM Filed M1729, 1949 FIG 7 .08

14 Sheets-Sheet.- 7

' TAN STONE VERMILLION ROCK HO Rept Cir. ReptCin] Rep'f. Cir Rept. Cir. LI 72l 725 73] 735 I I l Tone Unit Tone Uni'r Tone-Unit Tone Unit 722 732 736 Inc. Toll Inc. Toll Sel. 723 Sel. 733

Inc. Toll Inc. Toll Sel. 727 Sel. 737v RED GAP 1 r Toll Conn. 2 -Sel. I Sel. Inc. Off. 7|8 Sel. 717 Sel. 716 Sel. 715

Finder LOCCII fi 704 Sel. 705

Line Cir. f 70! Trunk Cir. I12 no INVENTOR.

John E. Osfline Attys March 10, 1953 J os L 2,6315195 TOLL SWITCHING SYSTEM Filed Jan. 29, 1949 14 Sheets sheet 8 108 fi L Cit Inc. Toll lnword Trk. Ans.Sv+ Cull Sw. Delayed Call 821 Sel. s25 Cir 84\ 832 833 Sw. 834' 0 9 Tone Unit 6 822 C.L.R.Trk. l

7 842 1 8 Toll Sel.

844 o Rept. 0|: Start Cir. 9 7' 825 f I J 83| 4 m I lnc.To|l 843 Oper.

DIAL 1 1 Tone Unit T BD TOIIC'Ir. 850 L fl- KeySet835 Reg. Tronsl. Sender se 'BB com. 836 852 I I Inc. Off. ACCESS Toll Conn. z sel l sel. Sel. 855 Sel. 853

l r I 'l Fmder Locol Sel. Spec. Serv. Inc. Spec 804 805 Sel. 806 Sel; 854

0 0 Llne 0n. 1

j) Inf. Desk.

- 2 Trunk Cir.

John E. Osfline I I i March 1953 J. E. OSTLINE TOLL SWITCHING SYSTEM 14 Sheets-Sheet 10 Filed Jan. 29. 1949 Attys.

JNVENTOR. John E. Osfline -36 So: 51 oio E on: 2E d m WW: Wm? 02E .2 mg 7: l wiwnw wl I MN m mal ili d6 38 2652 62 WV wmzz nn: EY v25 62 6.6 6 TQHFH 2v \wS: I O h. vm: 0 P z H IF BT 02 35 5 l G 8.6 -m TQ|\H N EXT -26 March 10, 1953 J. OSTLINE TOLL SWITCHING SYSTEM- 1 4 Sheets-Sheet 11 Filed Jan. 29, 1949 OON mohomjmm 32.

2 n: ON; m

JF ME INVENTOR. John E. Ostlin e Patented Mar. 10, 1953 UNITED STATE TENT OFFICE TOLL SWITCHING SYSTEM Application January 29, 1949, Serial No. 73,481

13 Claims. 1

The present invention relates to toll switching systems, and more particularly to such switching systems serving a vast territory commensurate with that of a nation or several adjacent nations.

Heretofore a long trans-nation toll call has been passed from a toll board in an originating oince to a toll board in a tandem ofiice and then passed to a toll board in another tandem office, if necessary, and then passed to a toll board in a terminating ofice and ultimately completed from the toll board in the terminating ofiice to a called subscriber substation. This passing of toll calls not only consumes considerable time and requires repeated handling by the operators at the toll boards in the various oiiices, but it offers several opportunities for errors to be made and is otherwise costly and inefiicient.

Accordingly, it is a general object of the present invention to provide an improved toll switching telephone system serving a vast territory, wherein the operator at the toll board in any originating office has access to switching and control equipment so that she may extend a toll call directly to any called subscriber substation in any terminating oflice without the assistance of an operator at a toll board in any other ofiice and regardless of the relative positions of the originating and terminating oiiices in the telephone system.

Another object of the invention is to provide in a toll switching telephone system of the character noted, equipment accessible to an operator at a toll board in any originating office that is controllable in accordance with fixed predetermined digits to efifect the completion of a toll call to a called subscriber substation in a terminating ofiice regardless of the relative positions of the originating and terminating offices in the telephone system.

further object of the invention is to provide a telephone system of the character noted that has a fixed and predetermined toll directory numbering plan which is uniformly applicable throughout and without reference to the relative positions of the originating exchanges and the terminating exchanges involved in the various toll calls in the telephone system.

A further object of the invention is to provide in a toll switching telephone system, an improved arrangement of the toll board and the register equipment in each toll office in the telephone system.

A. further object of the invention is to provide .in a toll switching telephone system, improved register-translator equipment that is located in one toll ofiice and capable of distinguishing between the toll calls that are to be completed respectively in near and in remote offices.

A still further object of the invention is to provide in a toll switching telephone system, improved register-translator equipment that is located in one toll oiiice and selectively controllable to effect the completion of a toll call in a near office and to pass a toll call that is to be completed in a remote oflice to another registertranslator equipment located in a tandem toll ofiice disposed between the one toll oflioe and the remote ofiice.

Further features of the invention pertain to the particular arrangement of the circuit elements of the telephone system, whereby the above outlined and additional operating features thereof are attained.

Sect. 1.The general arrangement of the telephone. system The invention, both as to its organization and method of operation, together with further objects and advantages thereof, will be best understood by reference to the following specification taken in connection with the accompanying drawings, in which Figure 1 is a schematic diagram of a portion of the territory served by a telephone system embodying the present invention and illustrating a number of toll areas into which the territory is divided andthe trunking plan therebetween; Figs. 2 to 8, inclusive, taken together, illustrate the general arrangement of the apparatus incorporated in several of the ofiices in several of the toll areas; Fig. 9 illustrates the mode of combining Figs. 2 to 8, inclusive, to form a unified diagram; Figs. 10 to 15, inclusive, taken together, illustrate the details of certain of the apparatus incorporated in one of the toll ofiices in one of the toll areas of the telephone system, which apparatus has embodied therein the features of the invention as briefly outlined above; and Fig. 16 illustrates the mode of combining Figs. 10 to 15, inclusive, to form a unified diagram.

More particularly, the lower portion of Fig. 2 illustrates diagrammatically some of the apparatus incorporated in the Blue Ridge ofiice; the upper portion of Fig. 2 and Fig. 3 illustrates diagrammatically some of the apparatus incorporated in the Amber Town toll office; the lefthand portion of .Fig. 4 illustrates diagrammatically some of the apparatus incorporated in the Maroon Lea .oifice; the right-hand portion of Fig. 4 illustrates diagrammatically some of the apparatus incorporated in the Orange Bay oiiice; the lower portion of Fig. 5 illustrates diagrammatically some of the apparatus incorporated in the Green Field office; the upper portion of Fig. 5 and Fig. 6 illustrate diagrammatically some of the apparatus incorporated in the Gold Hill toll office; the upper left portion of Fig. '7 illustrates diagrammatically some of the apparatus incorporated in the Tan Stone oflice; the upper right portion of Fig. 7 illustrates diagrammatically some of the apparatus incorporated in the Vermillion Rock oflice; the lower portion of Fig. 7 illustrates diagrammatically some of the apparatus incorporated in the Red Gap Office; and Fig. 8 illustrates diagrammatically some of the apparatus incorporated in the Rose Land toll ofiice.

More particularly, the upper portion of Fig. 10 illustrates a portion of the details of the operator position circuit I003 disposed at the dial toll board I000 in the Amber Town toll ofiice, as well as one of the associated links provided with an answer switch I08I and a call switch I682; the upper portion of Fig. 1'1 illustrates the details of one of the national toll circuits H disposed in the Amber Town toll office, together with the associated finder I I50; and the upper portion of Fig. 12 illustrates the details of one of the toll selectors I200 disposed in the Amber Town toll ofiice and individually associated with the national toll circuit H00. Finally, the lower portions of Figs. 10, '11 and *12 and Figs. 13, 1a and 15 illustrate the details of one of the register translators I300 disposed in the Amber Town toll office and accessible to the finder I I50.

Referring now more particularly to Fig. l of the drawings, the telephone system there illustrated serves a vast territory that may be commensurate with that of a nation, such, for example, as the United .States. The territory is divided into a large number of toll areas that are assigned individual area codes. As illustrated, the toll areas respectively disposed on the left, center and right of the territory are respectively assigned the area codes 2I8, 6M and 3! 9; other immeditate toll areas being positioned between the toll areas 2I8 and SM, and between the toll areas 6M and 319. In the arrangement the territory is so vast that in fact virtually every toll area comprises a tandem position with respect to every other toll area, although one may gain the impression from the simplified diagram of Fig. 1 that the toll areas 2I8 and 3% are terminal toll areas, which arrangement is not contemplated. Each toll area in the territory may be commen urate with a single city therein or with an entire state. depending upon the number of subscribers served by the particular toll area.

Each of the toll areas comprises one toll office and one or more other ofiices. Thus the toll areas 258, 4 and SIS respectively comprise the toll oflices Amber Town, Gold Hill and Rose Land, and respectively comprise the other offices Blue Ridge, Green Field and Red Gap. Also the intermediate toll areas positioned bet een the toll areas 218 and 6M comprise the offices Maroon Lea and Orange Bay; while the intermediate toll areas positioned between the toll areas EM and SIS comprises the ofiices Tan Stone and Vermillion Rock. Each office in each area is assigned an individual oiiice code. Thus the office code of the Amber Town toll ofiice may be AM! or merely 267; the office code of the Blue Ridge ofiice may be 31-6 or merely 25.6; the. office code of the Gold Hill toll ofiice may be G04 or merely 464; the office code of the Green Field ofiice may be GRS or merely 475; the ofi'ice code of the Rose Land toll oifice may be R02 or merely 762; and the ofiice code of the Red Gap ofiice may be RE3 or merely 733. Each oilice serves a number of subscriber lines and a maximum of 10,000 subscriber lines; and in each oifice each subscriber line is assigned a line number individual thereto. Thus the Blue Ridge office serves the subscriber substation TI connected to the subscriber line assigned the line number 1234; the Amber Town toll office serves the subscriber substation T2 connected to the subscriber line assigned the line number 1234; the Green Field oflice serves the subscriber substation T3 connected to the subscriber line assigned the line num ber 1234; the Gold Hill toll office serves the subscriber substation T4 connected to the subscriber line assigned the line number 1234; the Red Gap oiiice serves the subscriber substation T5 connected to the subscriber line assigned the line number 1234; and the Rose Land toll ofiice serves the subscriber substation T6 connected to the subscriber line assigned the line number 1234.

The various offices in the different toll areas are interconnected by groups of toll and trunk lines. Thus the Blue Ridge and Amber Town oiiices are connected by a group of trunk lines, including the trunk line I0]; the Green Field and Gold Hill offices are connected by a group of trunk lines, including the trunk line I01; and the Red Gap and Rose Land ofiices are connected by a group of trunk lines, including the trunk. line H2. The Amber Town and Gold Hill offices are connected by a group of toll lines, including the toll line I02. The Amber Town and Orange Bay offices are connected by a group of toll lines, including the toll line I03; the Amber Town and Maroon Lea omces are connected by a group of toll lines, including the toll line I05; the Gold Hill and Orange Bay offices are connected by a group of toll lines, including the toll line I04; and the Orange Bay and Maroon Lea ofiices are connected by a group of toll lines including the toll line I06. Likewise, the Gold Hill and Rose Land oflices are connected by a group of toll lines, including the toll line I08; the Gold Hill and Tan Stone oflices are connected by a group of toll lines, including the toll line I09; the Tan Stone and Vermillion Rock ofiices are connected by a group of toll lines, including the toll line H0; and the Vermillion Rock and Rose Land ofiices are connected by a group of toll lines, including the toll line III.

In accordance with the trunking plan each toll area in the territory is assigned an individual three-digit code, the first digit of which may be 2 to 9, the second digit of which may be 1 or 0, and the third digit of which may be 1 to 0. Each cfiice in each toll area is assigned an individual three-digit code, the first digit of which may be 2 to 9, the second digit of which may be 2 to 9 and. the third digit of which may be 1 to 0. Each subscriber line in each oflice is assigned an individual line number, the number of digits included therein being commensurate with the size of the ofiice, line numbers in 10,000-line oflices comprising four digits, line numbers in lO00-line ofiices comprising three digits, etc. Also, in accordance with the trunking plan the toll board in each toll oirlce is assigned the number and may be reached by any subscriber substation in any office in the toll area by dialing the number 110. Likewise, the numbers 112, etc, are assigned to the information desk, etc., in each'toll oflice in each toll area. Accordingly, it will be understood that the national directory number of each subscriber line in the territory comprises a three-digit area code, a three-digit oflice code and a multi-digit line number depending upon the size of the ofiice; whereby each subscriber line in a 10,000-1ine oifice comprises a ten-figure national directory number, since it comprises a four-digit line number.

Referring now to Figs. 2 to 8, inclusive, the subscriber line 20I extending to the subscriber substation TI in the Blue Ridge ofiice terminates in a line circuit 202 provided with a distributor 203 and is accessible to a group of finders, including the finder 204, the finder 204 being paired with a local first selector 205. Also the subscriber line 20I is accessible to a group of toll connectors, including the toll connector 2H3; that, in turn, is accessible to a group of second selectors, including the second selector 2H; that, in turn, is accessible to a group of first selectors, including the first selector 210; that, in turn, is accessible to a group of incoming ofiice selectors, including the incoming oifice selector 215. end of the trunk line I! terminates in a trunk circuit 2 I0 disposed in the Blue Ridge ofilce and individually connected to the incoming ofiice selector 2 I and accessible to the various local first selectors 205, etc. Likewise, the subscriber line 50I extending to the subscriber substation station T3 in the Green Field office terminates in a line circuit 502 provided with a distributor 503 and is accessible to a group of finders, including the finder 504, the finder 504 being paired with a local first selector 505. Also the subscriber line 50! is accessible to a group of toll connectors, including the toll connector 5I8; that, in turn, is accessible to a group of second selectors, including the second selector 5; that, in turn, is accessible to a group of first selectors, including the first selector 5H5; that, in turn, is accessible to a group of incoming ofiice selectors, including the incoming ofiice selector 5i5. One end of the trunk line I0! terminates in a trunk circuit 510 disposed in the Green Field ofiice and individually connected to the incoming ofiice selector 515 and accessible to the various local first selectors 505, etc. Likewise, the subscriber line I0! extending to the subscriber substation T5 in the Red Gap office terminates in a line circuit 102 provided with a distributor E03 and is accessible to a group of finders, including the finder 104, the finder F04 being paired with a local first selector I05. Also the subscriber line i0! is accessible to a group of toll connectors, including the toll connector H8; that, in turn, is accessible to a group of second selectors, including the second selector H1; that, in turn, is accessible to a group of first selectors, including the first selector '1 I6; that, in turn, is accessible to a group of incoming office selectors, including the incoming office selector 1 I 5. One end of the trunk line I I2 terminates in a trunk circuit H0 disposed in the Red Gap ofiice and individually connected to the incoming office selector 115 and accessible to the various local first selectors I05, etc.

The subscriber line 22I extending to the subscriber substation T2 in the Amber Town ofiice terminates in a line circuit 222 provided'with a distributor 223 and is accessible to a group of finders, including the finder 224, the finder 224 being paired with a local first selector 225. Also the subscriber line 22! is accessible to a group of toll connectors, including the toll connector One 254; that is, in turn, accessible to a group of. sec"- ond selectorsincluding the second selector 253; that, in turn, is accessible to a group of first selectors, including the first selector 252. The local first selector 225 has access to a group of special service selectors, including the special service selector 228; that, in turn, has access to a group of trunks extending to an information desk 222'. Also the Amber Town office comprises a dial toll board 5000 provided with a plurality of operator positions, including the first operator position circuit I003, and a position distributor 245. The operator position circuit I003 comprises a plurality of links, one of which is illustrated and includes an answer switch IO0I and a call switch 1002, as well as an associated start circuit 243 and a link distributor 244'. Also the operator position circuit I003 comprises a key set 235, an associated sender control circuit 230 and a connected sender 23! and a connected register 238. Also associated with the toll board I000 are a group of inward trunk circuits, including the inward trunk circuit 24!, and a group of C. L. R. trunk circuits, including the C. L. R. trunk circuit 242. Further a group of delayed call switches, including the delayed call switch 235, is accessible to the various answer switches I001, etc. The C. L. R. trunk circuits 242, etc., are accessible to the special service selectors 225, etc., and to a group of incoming special service selec tors, including the incoming special service selec tor 25L Also the incoming special service selectors 25! etc., have access to the trunks extending to the information desk'22l. One end of the trunk line I05. terminates in a trunk circuit 2H that is individually connected to the incoming special service selector 25L One end of the toll line I02 terminates in a repeater circuit 30I provided with an individual tone unit 302 and an individually connected incoming toll selector 32I. Likewise, one end of the toll line I03 terminates in a repeater circuit 303 provided with an individual tone unit 304 and an individually connected incoming toll selector 323. Finally, one end of the toll line I05 terminates in a repeater circuit 300 provided with an individual tone unit 301 and an individually connected incoming toll selector 326. Further, the Amber Town office comprises a group of national toll circuits, including the national toll circuit H00, the national toll circuit H00 having an individual finder H50 and an individually connected toll selector I200. Also the Amber Town ofiice includes a group of register translators, including the register translator I300, accessible to the finders H50, etc. Finally, the Amber Town office comprises agroup of incoming office selectors, including the incoming ofilce selector 332, and a group of access selectors, including the access selector 33L The answer switches I081, etc., have access to the inward trunk circuits 24!, etc., and to the C. L. R. trunk circuits 242, etc. The call switches I082, etc., and the delayed call switches 234, etc., have access to the national toll circuits H00, etc., to the access selectors 33I, etc., to the repeater cir cuits 30I, etc., to the repeater circuits 303, etc., and to the repeater circuits 300, etc. The incoming toll selectors 32I, 323, 326, etc., have access to the trunk circuits 2I I, etc., to the inward trunk circuits 2M, etc., and to the incoming oftice selectors 332, etc. The incoming office selectors 332, etc., have access to the first selectors, 252, etc; while the access selectors 33I, etc., have access to the trunk circuits 2| I, etc., and to the accrues incoming omce selectors 332, etc. The toll selectors I208 have access to the repeater circuits 391, etc., to the repeater circuits 393, etc., and to the repeater circuits 308, etc.

The subscriber line 6M extending to the subscriber substation T4 in the Gold Hill office terminates in a line circuit 602 provided with a distributor 6G3 and is accessible to a group of finders, including the finder 604, the finder 56 3 being paired with a local first selector H5. Also, the subscriber line 694 is accessible to a group of connectors, including the toll connector 65%; that is, in turn, accessible to a group of second selectors, including the second selector 653; that is, in turn, accessible to a group of first selectors, including the first selector 652. lhe local first selector 585 has access to a group of special service selectors, including the special service selector 555; that, in turn, has access to a group of trunks extending to an information desk 501. Also the Gold Hill office comprises a dial toll board 539 provided with a plurality of operator positions, including the first operator position circuit 63!, and a position distributor 545. The operator position circuit 63! comprises a plurality of links,

one of which is illustrated and includes an answer switch 632 and a call switch 833, as well as an associated start circuit 643 and a link distributor (354. Also the operator position circuit 53! comprises a key set 635, an associated sender control circuit 635 and a connected sender 537 and a connected register 538. Also associated with the toll board 639 are a group of inward trunk circuits, including the inward trunk circuit Edi,

and a group of C. L. R. trunk circuits, including I.

the C. L. R. trunk circuit 642. Further a group of delayed call switches, including the delayed call switch 534, is accessible to the various answer switches 632, etc. The C. L. R. trunk circuits 5 32, etc., are accessible to the special service selector 6%, etc., and to a group of incoming special service selectors, including the incoming special service selector 521, also the incoming special service selectors 52?, etc., have access to the trunks extending to the information desk 4 85?. One end of the trunk line it? terminates in a trunk circuit 5!! that is individually connected to the incoming special service selector 52?.

One end of the toll line :02 terminates in a repeater circuit 52l provided with an individual tone unit 522 and an individually connected incoming toll selector 525. Likewise, one end of the toll line 94 terminates in a repeater circuit 523 provided with an individual tone unit 52c and an individually connected incoming toll selector 525. Similarly, one end of the toll line Hi3 terminates in-a repeater circuit 5M provide-cl with an individual tone unit 552 and an individually connected incoming toll selector Similarly, one end of the toll line res terminates in a repeater circuit 546 provided with an in dividual tone unit 54! and an individually connected incoming toll selector 548. Further the Gold Hill office comprises a group of national toll circuits, including the national toll circuit 529, the national toll circuit 529 having an individual finder 53!) and an individually connected toll selector 549. Also the Gold Hill ofiice includes a group of register translators, including the register translator 53I, accessible to the finders 538, etc. Finally the Gold Hill ofiice comprises a group of incoming office selectors, including the incoming ofiice selector 528, and a group of access selectors, including the access selector 55L The answer switches 632, etc., have access to the in--- ward trunk circuits 5, etc., and to the C. L. R. trunk circuits 542, etc. The call switches 633, etc., and the delayed call switches 534, etc., have access to the national toll circuits 529, etc., to the access selectors 55!, etc., to the repeater circuits 54!, etc., to the repeater circuits 523, etc., and to the repeater circuits 546, etc. The incoming toll selectors 525, 526, 543, 5 43, etc., have access to the trunk circuits 5| 1, etc., to the inward trunk circuits 64!, etc., to the incoming ofiice selectors 528, etc., and to the national toll circuits 529, etc. The incoming ofice selectors 528, etc., have access to the first selectors 652, etc., while the access selectors 65!, etc., have access to the trunk circuits 5| I, etc., and to the incoming ofiice selectors 523, etc. The toll selectors 549, etc., have access to the repeater circuits 52 I, etc., to the repeater circuits 54!, etc., to the repeater circuits 523, etc., and to the repeater circuits 545, etc.

The subscriber line 2531 extending to the subscriber substation T5 in the Rose Land ofiice terminates in a line circuit 892 provided with a distributor 1333 and is accessible to a group of finders, including the finder add, the finder being paired with a local first selector 805. Also the subscriber line Bill is accessible to a group of toll. connectors, including the toll connee-tor 858; that is, in turn, accessible to a group of second selectors, including the second toll selector 35?; that, in turn, is accessible to a group of first selectors, including the first seiector 356. The local first selector 585 has access to a group of special service selectors, in-

the special service selector 8%; that, in turn. has access to a group of trunks extending to an information desk 88?. Also the Rose Land ofiice comprises a dial toll board 830 provided with a plurality of operator positions, including the first operator position circuit $31, and a position distributor M5. The operator position circuit 35! comprises a plurality of links, one of which is illustrated and includes an answer switch 832 and a call switch 833, as well as an associated start circuit 8:23 and a link distributor 3%. Also the operator position circuit 83! comprises a key set 835, an associated sender control circuit 836 and a connected sender and a connected register 838. Also associated with the toll board 839 is a group of inward trunk circuits, including the inward trunk circuit B ll, and a group of C. L. R. trunk circuits, including the C. L. R. trunk circuit 852. Further a group of delayed call switches, including the delayed call switch 334, is accessible to the various answer switches 832, etc. The C. L. R. trunk circuits 842, etc., are accessible to the special service'selectors 806, etc., and to a group of incoming special service selectors, including the incoming special service selector 854. Also the incoming special service selectors 854, etc., have access to the trunks extending to the iniorn'iation desk 35?. One end of the trunk line H2 terminates in a trunk circuit 8!! that is individually connected to the incoming special service selector 854.

One end of the toll line I98 terminates in a repeater circuit 32! provided with an individual tone unit 822 and an individually connected in--' coming toll selector 823. Likewise, one end of the toll line HI terminates in a repeater circuit provided with an individual tone unit 826 and an individually connected incoming toll selector 82?. Further the Rose Land ofiice comprises a group of national toll circuits, including the national toll circuit 850 having an individual finder 85! and an individually connected toll selector 880. Also the Rose Land oflice includes a group of register translators, including the register translator 852, accessible to the finders 85!, etc. Finally the Rose Land office comprises a group of incoming oflice selectors, including the incoming ofiice selector 855, and a group of access selectors, including the access selector 853. The answer switches 832, etc., have access to the inward trunk circuits 84!, etc., and to the C. L. R. trunk circuits 842, etc. The call switches 833, etc., and the delayed call switches 834, etc., have access to the national toll circuits 850, etc., to the access selectors 853, etc., to the repeater circuits 82!, etc., and to the repeater circuits 825, etc. The incoming toll selectors 823, 821, etc., have access to the trunk circuits 8II, etc., to the inward trunk circuits 84!, etc., and to the incoming oifice selectors 855, etc. The incoming office selectors 855, etc., have access to the first selectors 855, etc.; while the access selectors 853, etc., have access to the trunk circuits 8 I, etc., and to the incoming office selectors 855, etc. The toll selectors 860 have access to the repeater circuits 82!, etc., and to the repeater circuits 825, etc.

In the Maroon Lea ofiice, one end of the toll line I terminates in a repeater circuit 40! provided with an individual tone unit 402 and an individually connected incoming toll selector 43. Likewise, one end of the toll line I06 terminates in a repeater circuit 404 provided with an individual tone unit 405 and an individually connected incoming toll selector 400. The incoming toll selectors 403, etc., have access to the repeater circuits 404, etc.; while the incoming toll selectors 406, etc., have access to the repeater circuits 40!, etc.

In the Orange Bay ofiice, one end of the toll line I03 terminates in a repeater circuit M0 provided with an individual tone unit 4!! and an individually connected incoming toll selector M2. Likewise, one end of the toll line I06 terminates in a repeater circuit 4I3 provided with an individual tone unit III4 and an individually connected incoming toll selector 4I5. Finally one end of the toll line I4 terminates in a repeater circuit 4I6 provided with an individual tone unit 4!! and an individually connected incoming toll selector M8. The incoming toll selectors 4I2, etc., and the incoming toll selectors 4! 5, etc., have access to the repeater circuits 4I6, etc.; while the incoming toll selectors 4I8, etc., have access to the repeater circuits 4I0, etc., and to the repeater circuit 4I3, etc.

In the Tan Stone oflice one end of the toll line I09 terminates in a repeater circuit I2! provided with an individual tone unit I22 and an individually connected incoming toll selector 723. Likewise, one end of the toll line III) terminates in a repeater circuit I25 provided with an individual tone unit I26 and an individually connected incoming toll selector 121. The incoming toll selectors I23, etc., have access to the repeater circuits I25, etc.; while the incoming toll selectors I21, etc., have access to the repeater circuits 12!, etc.

In the Vermillion Rock office one end of the toll line IIO terminates in a repeater circuit I3! provided with an individual tone unit I32 and an individually connected incoming toll selector I33. Likewise, one end of the toll line III terminates in a repeater circuit I35 provided with anindividual tone unit I36 and. anindividually 10 connected incoming toll selector 137. The incoming toll selectors I33, etc., have access to the repeater circuits I35, etc.; while the incoming toll selectors 131, etc., have access to the repeater circuits I3!, etc.

Sect. 2.-The apparatus incorporated in the telephone system Preferably the dial toll boards I000, 630 and 830 respectively disposed in the toll offices at Amber Town, Gold Hill and Rose Land are substantially identical to that disclosed in United Estates Patent No. 2,353,212, granted on July 11 i944, to Harvey W. Balzer, with the exception of certain minor changes that have been incorporated in the operator position circuits I 003 etc., in the answer switches !08!, etc., and in the call switches I082, etc., as disclosed in Fig. 10. More particularly, each operator position circuit I 033, etc., is modified slightly by the addition of a national toll key KI002, a national toll relay RI025, an auxiliary dial rear relay RIOI0 and two control relays RIOI5 and RI020; while each answer switch I08I, etc., and each call switch I032, etc., are modified slightly to include the respective control conductors CI033 and CI032 fir a purpose more fully explained hereinafter.

been modified slightl v y in accordance with the modification in each RISE. Thus, for example, it will be understood that the toll board I000 in the Amber Town oflice comprises the operator position circuit I003 the answer switch I08I, the call switch I082 the delayed call switch 234, the key set 235, the sender control circuit 236, the sender 231, the register 238, the inward trunk circuit 24!, the C. L R trunk circuit 242, the start circuit 243 the link cisth utor 244, the position distributor 24s respectively corresponding to these elements as disclosed in the Balzer patent mentioned. Preferably the repeater circuits 30 I, etc., in the amber Town office, the repeater circuits 52! etc in the C- old Hill oflice and the various other cor responding repeater circuits in the various other oflices are identical to that disclosed in Figs. 4 to 6, inclusive, of the co-pending application of John Wicks and Otho D. Grandstafi Serial l lo. 749,758, filed May 22, 1947. This repeater circuit disclosed in the Wicks and Grandsta f application mentioned constitutes a direct iniprovement over the repeater circ fatten}: No. 2,155,176, grant o o n Wicks. Similarl that the tone units 302, etc., 522f et :ege cf v e lg associated with the repeater circuits 30! 52! etc are dentical to that disclosed in the cos-pending application of Otho D. Grandstafi 'Serial No 7 8,194, filed March 29, 1947. This tone unit disclosed in the Grandstaff application mentioned constitutes a direct improvement over the tone unit disclosed in U. S. Patent No. 2159 081 granted on May 23, 1939, to Otho D. Gretntistaii More particularly, each pair of repeater circuits Sill-52!, etc., and the associated pairs of tone units 302-422, etc., are of the voice frequen y dialing and controlling type; whereby the toll lines I02, etc., terminated by the respective pairs ed on April 18,

oreover, each delayed call switch 234, etc., hasuit disclosed in of repeater circuits may incorporate voice frequency repeaters, not shown, of the vacuum tube, automatic volume control type. In other words, the repeater circuits of a pair are capable of operating in conjunction with a toll line that, in turn, incorporates voice frequency vacuum tube repeater apparatus.

In each office each subscriber substation is provided with conventional automatic subscriber substation apparatus, and the various finders and selectors are of the conventional Strowger types unless otherwise specifically noted. Likewise, in each office the trunk circuits 2, etc., the distributors 223, etc., and the line circuits 222, etc., may be of any suitable type. Further, in each toll office the information desk 22'], etc., may be of any suitable manual type; and in passing it is noted that in each ofilce the first selectors 225, etc., are of the conventional first-digitdrop-back type.

Preferably the national toll circuits H218, etc., in the various toll ofi'ices are identical. As illustrated in Fig. ll, the national toll circuit Milt comprises a relay group including a line relay RI I iii, a hold relay R! iZt, a switch-through R! 13% and a cut-through relay RI Mil; while the individually associated finder H55 comprises five individual wipers H5! to H55, inclusive, provided with an associated rotary magnet Mi E55.

Preferably the toll selectors 12cc, etc., individually associated with the national toll circuits H95, etc., in the various offices are identical. As illustrated in Fig. 12, the toll selector i236 comprises a relay group including a line relay Hi2 i e, a hold relay Rl229, a series relay Ri23il, a step relay RL'ZAG and a switch-through relay REZEE. Also the toll selector I286 comprises a Strowger mechanism provided with a vertical magnet M1225, a rotary magnet M1226 and a release magnet Mi228. Associated with the Strowger mechanism are two sets of switch springs S125! and Si233 that are operated when the wiper carriage is driven one step in the vertical direction away from its normal vertical position. Also associated with the Strowger mechanism are two sets of switch springs Sl234 and S1235 that are operated when the wiper carriage is driven eleven steps in the rotary direction away from its normal rotary position.

Preferably each of the register translators I300, etc., in the various ofiices are identical. The register translator I300 comprises, as illustrated in Figs. to 15, inclusive, three area registers Al, A2 and A3 adapted to register the respective first, second and third digits of the three-digit area code, as well as three ofiice registers Ol, 02 and 03 adapted to register the respective first, second and third digits of the three-digit ofiice code, and finally four numerical register Ni, N2, N3 and N4 adapted to register the respective first, second, third and fourth digits of the four-digit line number. The first area register Al is of the minor switch type including a single wiper Al I, an operating magnet A12, a release magnet A13 and an off-normal set of switch springs A15; the second area register A2 is of the minor switch type including two wipers AM and A24, an operating magnet A22, a release magnet A23 and an off-normal set of switch springs A25; and the third area register A3 is of the minor switch type including a single wiper A3I, an operating magnet A32, a release magnet A33 and an ofi-normal set of switch springs A35. The first ofiice register OI is of the minor switch type including a single wiper OH, an

operating magnet 012, a release magnet OB and two off-normal sets of switch springs 015 and (M6; the second office register 02 is of the minor switch type including two wipers 021 and 024, an operating magnet 022, a. release magnet 023 and an off-normal set of switch springs 025; and the third ofiice register 03 is of the minor switch type including a single wiper 03!, an operating magnet 032, a release magnet 033 and an off-normal set of switch springs 035. The first numerical register NI is of the minor switch type including a single wiper N5 I, an operating magnet Ni2, a release magnet N13 and two offnormal sets of switch springs N M and N15; the second numerical register N2 is of the minor switch type including a single wiper NZI, an operating magnet N22, a release magnet N23 and an off-normal set of switch springs N25; the third numerical register N3 is of the minor switch type including a single wiper N31, an operating magnet N32, a release magnet N33 and an oil'- normal set of switch springs N35; and the fourth numerical register NA is of the minor switch type including a single wiper N-ii, an operating magnet N42, a release magnet N43 and an oilnormal set of switch springs N45.

Also the register translator i399 comprises an area composite switch AC of the Strowger type including two wipers AC! and AC2, a vertical magnet AC3, a rotary magnet A04 and a release magnet AC5. A set of oil-normal switch springs AC6 is associated with the wiper carriage of the Strowger mechanism and operated when it is driven one step in the vertical direction away from its normal vertical position. The area composite switch AC is set in the vertical direction in accordance with the digit registered in the first area register Al and is set in the rotary direction in accordance with the digit registered in the third area register A3; and one of the two wipers of the area composite switch AC is selected in accordance with the digit registered in the second area register A2. Similarly the register translator 13% comprises an ofiice composite switch 00 of the Strowger type including eight wipers OCi to 8, inclusive, a vertical magnet 0C9, a rotary magnet OCH! and a release magnet OCH. A set of ofi-normal switch springs OCiZ is associated with the wiper carriage of the Strowger mechanism and operated when it is driven one step in the vertical direction away from its normal vertical position. The oflice composite switch 06 is set in the vertical direction in accordance with the digit registered in the first ofiice register Oi and is set in the rotary direction in accordance with the digit registered in the third ofilce register 03; and one of the eight wipers of the ofiice composite switch 00 is selected in accordance with the digit registered in the second ofiice register 02.

Also the register translator i388 comprises an area route switch AR that is controlled by the area composite switch AC. The area route switch AB is of the Strowger type including a vertical control wiper ARI and seven rotary wipers ARZ to AR8, inclusive, a vertical magnet AR9, a rotary magnet ARM and a release magnet ARH. A set of off-normal switch springs ARI 2 is associated with the wiper carriage of the Strowger mechanism and operated when it is driven one step in the vertical direction away from its normal vertical position. Similarly, the register translator will! comprises an oflice route switch OR that is controlled by the oflice composite switch 0C. The oifice route switch 0R 

